DO NOT skip the glaze.
Lemon Sheet Cake with Lemon Glaze
2 cups all purpose flour
Preheat oven to 325 degrees. Grease and flour a 13x9-inch baking pan. Sift together the flour, baking powder and salt, and set aside.
With an electric mixer, beat the butter at medium-high setting for 2 minutes. Ad the sugar gradually, beating for 5 to 6 minutes. Add the vanilla extract and lemon zest and beat until incorporated. Add eggs and egg yolks, one at a time, beating well after each addition.
Turn mixer speed to low and add the sifted flour mixture alternately with the buttermilk. Scrape down sides of mixer bowl as needed, and beat until the batter is uniformly smooth. Pour batter into prepared pan, and bake for 50 minutes to 1 hour, or until a toothpick in center of cake comes out clean.
While the cake is baking, make the glaze.
juice from 2 lemons
Mix all ingredients and stir well several times until sugar is dissolved
When the cake has baked and cooled for about 10 minutes, brush the surface with the glaze using a pastry brush. Use all the glaze.